Family and colleagues of Sydney police officer Bryson Anderson, who was murdered nearly two years ago, describe their continuing grief over his stabbing death during a sentencing hearing for his killers.

A mother and son have been committed to stand trial for the stabbing murder of Sydney police officer Bryson Anderson.

Fiona Barbieri, 46, and her 20-year-old son Mitchell Barbieri are accused of killing Detective Inspector Bryson Anderson when he was called to a neighbourhood dispute at Oakville in Sydney's north-west in 2012.

They are charged with murder and wounding with intent to resist arrest.

In Central Local Court magistrate Chris O'Brien has ordered them to stand trial in February 2014.